pop method
T?
pop()
Implementation
T? pop() {
if (isEmpty) return null;
final T lastElement = _underlyingQueue.last;
_underlyingQueue.removeLast();
return lastElement;
}
T? pop() {
if (isEmpty) return null;
final T lastElement = _underlyingQueue.last;
_underlyingQueue.removeLast();
return lastElement;
}